Tunze DOC Skimmer 9415

Tunze DOC Skimmer 9415 is a sump-mounted protein skimmer designed for nutrient control in large marine and reef aquariums. It removes dissolved organic compounds before they break down into nitrate and phosphate. Intensive mixing of air and water also promotes gas exchange and supports a high oxygen level.

The skimmer produces large quantities of fine air bubbles. Dissolved organic compounds attach to their surfaces and rise through the foam reactor into the two-litre collection cup. Removing organic waste before decomposition helps maintain clear water and more stable conditions for marine fish and corals.

DOC Skimmer 9415 is suitable for fish-only marine aquariums, soft coral systems, LPS reefs, mixed reefs, and appropriately sized SPS-dominated aquariums. The nominal maximum recommendation is 1,500 litres, but the practical aquarium capacity depends on coral sensitivity, fish population, feeding, and additional nutrient-export methods.

Hydrofoamer Silence

The Hydrofoamer Silence pump creates an effective mixture of air and water with quiet operation. It delivers an air capacity of 1,000 litres per hour and a water flow rate of 900 litres per hour.

Power consumption is only 15 W, making the skimmer economical for continuous operation. An integrated air silencer reduces intake noise and makes the skimmer suitable for aquariums installed in living spaces.

Automatic overfoaming protection

The Tunze Anti-Overfoaming System helps prevent the collection cup from overflowing. Water conditioners, additives, coral adhesives, new filtration media, and accidental contaminants can cause sudden changes in water surface tension and excessive foam production.

When excessive foam is detected, the system automatically limits skimming activity. Normal operation resumes after the aquarium conditions stabilize.

Two-litre collection cup

The large two-litre collection cup provides ample capacity for the waste produced by a high-performance skimmer. Its generous size reduces the required emptying frequency.

The collection cup and foam reactor can be removed for cleaning. Clean the cup neck regularly because accumulated organic deposits gradually restrict foam movement and reduce skimming performance.

The skimming result can be adjusted towards wetter or drier collection. Dry skimming produces darker and more concentrated waste, while wet skimming fills the cup more quickly with lighter liquid.

Removable post-filter

A compatible post-filter can capture fine suspended particles and help reduce microbubbles returning to the sump.

Compatible filtration media, including activated carbon or phosphate absorber, can also be placed inside the post-filter. The media must not restrict water flow and should be cleaned or replaced regularly.

Stable operation

DOC Skimmer 9415 operates at an immersion depth of 100–200 mm without requiring a separate water-level adjustment. This makes installation straightforward in different sump configurations.

A stable sump water level still provides the most consistent skimming result. Install the skimmer in a chamber where evaporation and return-pump operation do not change the water depth.

Aquarium sizing

The 1,500-litre maximum recommendation is intended for marine systems with relatively low sensitivity to dissolved organic compounds. More sensitive reef systems require more conservative sizing.

• Soft coral, leather coral, and anemone aquariums: up to approximately 1,500 litres
• LPS and mixed reef aquariums: up to approximately 900 litres
• SPS-dominated reef aquariums: up to approximately 600 litres
• Heavily stocked SPS aquariums: up to approximately 450 litres

These recommendations are approximate. Intensive feeding, a large fish population, or using the skimmer as the primary nutrient-export method may require a larger skimmer.

Key features

• High-performance protein skimmer for marine aquariums
• Nominally suitable for aquariums up to 1,500 litres
• Suitable for soft coral, LPS, SPS, and mixed reef systems
• Hydrofoamer Silence pump
• Air capacity of 1,000 l/h
• Water flow of 900 l/h
• Power consumption of only 15 W
• Quiet air intake and pump operation
• Automatic Anti-Overfoaming System
• Helps prevent collection-cup overflow
• Large two-litre collection cup
• Removable collection cup and foam reactor
• Compatible with a post-filter
• Post-filter can hold filtration media
• Designed to reduce microbubbles
• Operates at an immersion depth of 100–200 mm
• Designed for sump installation
• Suitable for continuous operation

Technical information

• Product number: 9415.000
• Recommended maximum aquarium size: 1,500 l
• Water flow rate: 900 l/h
• Air capacity: 1,000 l/h
• Power consumption: 15 W
• Power supply: 230 V / 50 Hz
• Recommended immersion depth: 100–200 mm
• Collection cup volume: 2 l
• Skimmer dimensions: 350 × 300 × 440 mm
• Collection cup dimensions: diameter 215 mm × height 218 mm
• Required clearance for cup removal: at least 71 mm

Installation and setup

1. Provide at least 350 × 300 mm of free sump floor space.
2. Leave at least 71 mm of clearance above the skimmer.
3. Install the skimmer in a chamber with a stable water level.
4. Set the immersion depth between 100 and 200 mm.
5. Make sure the skimmer stands level and securely.
6. Install the post-filter and other components according to the instructions.
7. Keep the power cable and electrical connections dry and protected.
8. Create a drip loop before the electrical socket.
9. Start the skimmer and monitor foam production.
10. Check the collection cup frequently during the initial running period.
11. Clean the collection cup and foam riser regularly.
12. Maintain the Hydrofoamer pump and impeller chamber according to the instructions.
13. Disconnect the skimmer before maintenance or working inside the sump.